One way:

1.Remove it to see whether 1791 (0x6ff) recurs if you recently added hardware to the computer. If existing new app has failed, remove or replace the faulty component. Run hardware diagnostics that the system manufacturer supplies to determine which hardware component failed.

2.If the 1791 (0x6ff) occurred after the installation of a new or updated device driver, you should remove or replace the driver. If, In this situation, the 1791 (0x6ff) occurs in the startup sequence as well as the system partition is formatted with NTFS, you might be able to use Safe Mode to rename or delete the faulty driver. You have to start the computer by using the Recovery Console in order to access the file if the driver is used as part of the system startup process in Safe Mode.

3.You can examine the System Log on Event Viewer for added error messages that might help identify the unit or driver that is inducing the 1791 (0x6ff). This error can also be solved by stoping use memory caching of the BIOS.

At last we recommended you another way,hope our solutions can be useful for you to remove 1791 (0x6ff)!

Method two:

1791 (0x6ff) is very harmful for your useful data and it is due to the damage of windows system files . This error may also be due to many reasons. Like :

1.Over this major errorusers to resolve Configuration error of Outlook Express.

2.It was because that the setting up of Outlook Express was uncompleted.

3.Wrong deletion of application or hardware.

4.Because of spyware attack,virus and adware and they do great damage to the machine.

5.Improperly de-activate computer or as a result of breakdown of electric results in 1791 (0x6ff).

Symptom of 1791 (0x6ff)

When the error 1791 (0x6ff) encountered you will recognize that your system and Outlook PST files will not be working in order. There are several symptoms which shows the occurance of this error. Including:

1.You can find Outlook working wrongly. Each of us may have outlook startup issue and it can hang over and over.